Valve for reversing furnaces



June 12, 1928. I H. C. 'PERDUE VALYE FOR REVERSING FURNACES Filed Aug.24, 1925 HENRY C Fara/.5

fl 6mm;

Patented June 12, 1.928.

UNITED STATES PATENT'OFFICE.

HENRY G. PE RDUE, 0F HIGHLAND PARK, MICHIGAN, ASSIGNOB 0F ONE-HALF T9WILLIAM ROBERT WILSON, 01" DETROIT, MICHIGAN,

1 vALvn roa nnvnnsiivernnnacns.

ap iicmon area August 24, 1925. Serial in. 51,963.

which tends to eliminate the necessity for lifting heavy parts, and atthe same time one that will hold up under heavy duty.

Another object of my invention is to pro vide a three-way valve, for usein reversing furnaces so constructed that theniain valve water sealremains constant. while a port' seal, constructed to permitreversal isnormally sealed in asetfective a manner as the main valve seal; that isto say. the portseal is the only seal broken, or in any way modi fied atthe time of reversal. so that an efl ective and constant seal is alwayshad to.

prevent explosion or outward escape of gas. VVitbtheseandother ob ectsin View, my

' invention consists in the arrangement, combination and construction ofthe various parts of my improved device. as described in thespecification, claimed in my claims and shownin the accompanyingdrawing.

Fig. 1 isa plan sectional view of my im proved device taken on line .LIJofFig. 2.

F ig. 2 is a cross sectional View ofmy improved device taken on line 2-2ofFig. 1.

I have shown, more or less diagrammatically. a foundation 1.0 of aconventionalstack flue 11, a conventional gas passage 12 and aconventional furnace port13, asused in a reversing type furnace, using athree-ported valve. l

side circular wall 15 and inner walls 16 around the edges of the ports11, 12 and 13. The walls 15 and 16 forman outside trough 2O with troughs21 leading therefrom and terminating at a common point, as in the center22 of the base 10.

A cross member 23 is suspended over the base 14 by the beams 24 that aresecured. to the projections 25 of the base. Positioned, on a ballconnection, in a member 1.9 on the base 14, and extending through andabove the member 23, is a shaft 26 that is mounted for rotation in abearing casting 27. as well as a ball connection96. A valve hood 29having a top 28 the outside wall 97 A valvebase 14 is'provided having anoutand the inner walls 98 and 99 extending from the center 22 to thewall 97 is connected to the shaft 26, so as to rotate therewith. Thebottom edges of the hood extend partially into the trough 20 to form awater seal. A smaller hood 34, havinga short outer vertical shell 35,and a long inner vertical shell 36 is shown as covering the stack flue11. Atrough 31 is formed by a member 33, which is L shaped in. crosssection, se cured to the inside of a section of the wall a 97 andoutside of walls 98 and 99. The shell 35 fits into tbetrough 31 and theshell 36 extends down into the troughs 20 and 21, around the wall. 16 ofthe flue 11.

Stop plates 37 adapted to strike the beams 24, are placed on the hood 29to prevent complete rotation thereof and to aid in positioning the smallhood 34 over either the flue 11 or the passage 12.

Fulcrumed on the shaft 26, as at 95, by 1 means of a block 38 fixed tothe shaft, is a lever 40 that has an adjustable balance weight 41 on theend 42 thereof. A. vertical lever 43 is pivoted at one end to the end 44of the lever 40 and on the other end to a T plate 45, secured to thecenter of the small hood 34.

In the practical use of my improved device, water 46 is placed in thetroughs 20 and 21 to form an air tight seal for the valve hood 29, andalso in the trough 31 to form a seal-for the small hood 34. In theadmission of gas into the furnace, as shown in Fig. 1, the small hood 34is placed over the stack flue 11, so thatthe shell 36 extends into thewater in troughs 20 and 21 around the wall 16v of the stack and theshell 35 is placed in the water in the trough 31, thus forming a doubleseal, which completely closes the'stack opening. At the same time. thelarge hood29 permits the How of gas from the passage 12 into the furnaceport 13.

When it is desired to stop the flow of gas and open the furnace to thestack 11., enough pressure is placed on the end 42 of thelever 40 tolift the hood 34 far enough so that the shell 36 clears the wall 16 ofthe stack flue 11, but notenoughto break the water seal of the shell 35in the trough 31. The hoods 29 and 34 and the lever 40 are then rotatedwith the shaft 26 until. stopped by one of the plates 37 bearing againstone of the beams 24. Inasmuch as the botton edges of the walls 98 and 99extend only to the level of the trough 31, it will be readilyappreciated that they clear the tops of openings 12 and 13 when the hood29 is rotated. The pressure on the end 42 of the lever 40 is thenreleased, thus allowing the hood 34 to lower so that the shell 36thereof will completely surround the wall 16 of the gas flue, and beagain sealed by the water in the troughs 20 and 21.

It will be noted from the foregoing, that in this manner, I provide athree-way reversing valve that has an air ti ht seal at all times formedby the water in tie troughs 20, 21 and 31, this seal not being reducedor in any manner lessened while reversing. It will further be apparentthat the reversal is obtained without the necessity of lifting heavyparts of the mechanism.

I have not here shown any specific means for raising and lowering thelever 40, nor for rotating it and the parts connected with it, inasmuchas any mechanism wellknown in the art may be used for this purpose.

It is obvious that various changes may be made in the arrangement,combination and construction of the various parts of my improved device,without departing from the spirit of my invention, and it is myintentlon to cover by my claims such changes as may be reasonablyincluded within the scope thereof What I claim is:

1. In combination, three openings, a rotata'ble hood positioned over twoof said openings, a liquid seal for the bottom edge of said hood, asecond hood positioned over the third opening, and sealed in said liquidseal, a shell secured to said second hood, a liquid seal for said shellof greater depth than said first seal, means for lifting said secondhood to clear said third opening and thereby break its seal with saidfirst liquid seal, means of rotating the hoods to permit the second hoodto center over one of said first two openings and said first hood toposition over the other two openings, said seal of said shell remainingunbroken throughout said shifting and raising of said second hood.

2. In combination, a base having rimmed openings therein, a shaftextended upwardly from said base, a hood secured to said shaft andcovering certain of said 0 enings, a second hood covering other of saiopenings, liquid seals for the bottoms of said hoods, a depending shellfrom said second hood having a liquid seal for the bottom thereof, meansfor lifting said second hood and breakin its liquid seal, means forrotating sai: hoods, to locate said second hood over an openingpreviously covered by said first hood and to cover the openingspreviously covered by said second hood with said first hood, and meansfor lowering said second hood over its new opening and engaging thebottom thereof in a liquid seal.

I 3. In a device of the class described, comprising a hood having anopening therein, a liquid seal around said opening, a second hood havingan outer shell depended there y from and means adapted to place saidsecond hood over and into said openin said shell being positioned in theli uld sea 4. In a device of the c ass described, com prising a hoodhaving an opening therein, a rimmed port, a second hood covering saidopenin and having a depending portion extending through said openingsurrounding the rim of said port, a liquid seal for the bottom of saiddepending portion, a shell depended from said second hood, surround-ving said depending portion, a liquid seal around the oienin bottom ofsai shel means for lifting said second hood above said rim and therebybreaking its seal, said shell seal being of sufficient depth to remainunbroken during such lifting.

5. In combination, rimmed ports, a rotatable hood having an openingtherein posit-ioned around said ports, a liquid seal for the bottom ofsaid hood, 9. second hood having a portion thereof extending through theopening in said first hood into said water seal and having its bottomsurrounding one of said rims, a shell depended from said second hood, awaterseal from the bottom of said shell around the opening in said firsthood, and means for lifting said second hood to clear said, rimmed portsand to break the water seal thereof, the seal for said shell remainingunbroken during such lifting.

HENRY C. PERDUE.

in first hood for the

